[SystemSafety] Technical information on Airbus A320 recall?

[Prof. Dr. Peter Bernard Ladkin]

On 2025-11-30 15:33 , Brian Jepson wrote:
> On 30/11/2025 14:07, Prof. Dr. Peter Bernard Ladkin wrote:
>> Which doesn't help answer David's question of how a pure *software* change can affect SEE 
>> subsceptibility.
>
> Software cannot prevent SEE it can defend against the effects of an event.
>
It is clear to me that you can write SW which makes a computer more resilient to the effects of 
SEEs. It is not at all clear to me how you can write SW which makes a computer more susceptible to 
the effects of SEEs, except by removing code which made it so resilient in a previous version.

I guess one way might be that new software accepts a greater range of input values from sensors, so 
that there is a greater range of input available for SEE corruption which affects program execution. 
However, I don't see how reverting to a narrower range of inputs would help prevent SEE corruption 
except in a purely statistical sense. So I wouldn't think that is what is going on in the current 
situation.

PBL

Prof. Dr. Peter Bernard Ladkin
Causalis Limited/Causalis IngenieurGmbH, Bielefeld, Germany
Tel: +49 (0)521 3 29 31 00